package com.zsr.servlet;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.List;

public class UploadServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

//        ServletInputStream inputStream = req.getInputStream();
//        byte[] buffer=new byte[1024000];
//        int read = inputStream.read(buffer);
//
//        System.out.println(new String(buffer,0,read));

        //1. 先判断上传你的数据是否有多段数据（只有是多段数据，才能上传解析）
        if(ServletFileUpload.isMultipartContent(req)){

            //创建FileItemFactory 工厂实现类
            FileItemFactory fileItemFactory=new DiskFileItemFactory();
            //创建用于解析上传数据的工具类ServletFileUpload类
            ServletFileUpload servletFileUpload =new ServletFileUpload(fileItemFactory);

            try {
                // 解析上传的数据，得到每一个表单项FileItem
                List<FileItem> list = servletFileUpload.parseRequest(req);

                //循环判断，每一个表单项，是普通类型，还是上传的文件
                for(FileItem fileItem : list){

                    if(fileItem.isFormField()){
                        //普通表单项

                        System.out.println("表单的name属性值："+fileItem.getFieldName());
                        //参数UTF-8 ,解决乱码问题
                        System.out.println("表单的value属性值："+ fileItem.getString("UTF-8"));
                    }else{
                        //上传的文件

                        System.out.println("表单项的name属性值："+fileItem.getFieldName());
                        System.out.println("上传的文件名："+fileItem.getName());

                        fileItem.write(new File("d:\\" +fileItem.getName()));
                    }

                }

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
